5Kaneko S, Tanaka K, Toyota T, et al. Water efficiency of agricultural production in China: regional comparison from 1999 to 2002. International Journal of Agricultural Resource, Governance and Ecology, 2004,3:231-251.
6Dhehibi B, Lachaal L, Elloumi M, et al. Measuring irrigation water use efficiency using stochastic production frontier: an application on citrus producing farms in Tunisia. African Journal of Agricultural and Resource Economics, 2007, 1(2):1-15.